Siemens SIMATIC 505 - Auto Cushion Control Logic Diagram

Sample RLL and Logic Diagrams
B-4
B.3 Auto Cushion Control Logic Diagram
Average
cushion
Shot
size
Cushion
setpoint
Last
shot
factor
Correction
Current
shot
Previous
average
New
average
factor
Avg
cushion
Cushion
setpoint
Size setpoint
setpoint
Auto
cushion
control
average
last 10
end-of-shot
positions
Yes
Load auto
shot size
into T -mold
plasticate table
Just put
into run
mode?
Yes
(Optional
block)
(V)
Preload
running
average
to cushion
setpoint
(V)
(V)
Correction factor
equals
cushion setpoint
minus
end-of-shot avg.
Adjust shot size
in T -mold
plasticate table
w/correction
factor
Next
RLL
logic
(V)
(V)
(V)
No
Correction
(V)
(V)
(V)
New shot
(V)
(V)
(V)
Pack
complete
No
Figur e B-3 Auto Cushion Contr ol Logic Diagram for RLL Implementation